MOLLUSCA 01" THE ' CHALIENGEE ' EXPEDITION. 325 



gutter; the edge is sharp, but is strengthened a little way 

 within by a small longitudinal rib, which is of a ruddy white 

 colour. To-p obliquely truncated, small, with a blunt keel round 

 the edge of the minute, shallow, conical depression, which is half 

 choked by the outer lip. Inner lip : a very thin glaze extends across 

 the gibbously and convexly curved body ; there is a slight angle 

 at the base of the pillar, which is direct, a little oblique, hardly 

 patulous, scarcely twisted, very narrow, most feebly toothed and 

 truncate in front ; behind the sharp edge is a small but deep 

 umbilicus. L. 0"16. B. 0*09. B. of mouth at same place, O'Ol. 

 This is a very peculiar form, extremely like an Ovula both in 

 shape and in the thickness of the outer lip, the edge of which, 

 however, is sharp. 



8. Ctlichna (Yolvula) paupeectila, n. sp. 



St. 24. Mar. 2.5, 1873. Lat. 18° 38' 30" K, long. 65° 5' 30" W. 

 N. of Culebra Island, St. Thomas, Danish W. Indies. 390 fms. 

 Coral-mud. 



Shell. — Small, cylindrically oblong, with a short, blunt, but 

 pointed top, white, faintly spiralled. Sculpture. Longitudinals — 

 there are fine close-set lines of growth. Spirals — the whole shell 

 is scored with fine, shallow, remote, scarcely fretted furrows. 

 Colour ivory-white. Mouth arched, narrow above and throughout 

 the greater part of its length, but widening in front, where the 

 body of the shell contracts on the base ; above it rises beyond 

 the top of the body, and in front goes slightly beyond the point 

 of the pillar. Outer lip is gently curved in the middle, with a 

 quick bend at either end ; its edge seems to be nearly level, but 

 emarginate in front. Top contracts rather quickly to a small 

 central tip. Inner lip : a pretty distinct glaze covers the body ; 

 in front of this the narrow pillar projects somewhat obliquely, 

 with a slight twist and prominent edge, and is rather abruptly 

 cut ofli" at the point ; behind it lies a small furrow running up 

 into a minute umbilical chinJi. L. 0-062. B. 0'03. B. of 

 mouth at same place, O'OOS. 



The V. acuta, d'Orb. {Bulla), a Cuban species, is much sharper 

 and more hunchy. V. angustata, A. Ad., is more cylindrical and 

 less stumpily pointed above. 



9. Ctlichita (Volttila) sulcata, n. sp. 



Sept. 7, 1874. Torres Straits, N. of Australia. 3-11 fms. 



